Under multiplex_profiles the Hindsight provider's writer, daemon-start and
prefetch threads were spawned as bare threading.Thread, so they started with
an empty contextvars Context: no profile secret scope and no HERMES_HOME
override. get_secret() fails closed there, so the local_embedded daemon never
booted and every retain raised UnscopedSecretError, even though the spawning
thread (initialize()/sync_turn() inside the gateway's copy_context'd turn) had
the scope all along.
Spawn each thread with contextvars.copy_context().run so the child inherits
the spawner's scope + home override. No environ fallback, no re-parsed .env.
The shared hindsight-loop thread needs no wrap: coroutines submitted via
run_coroutine_threadsafe already run in the submitter's context per call.
Fixes#92608Fixes#94933
Co-authored-by: KIAgent01 <297567825+KIAgent01@users.noreply.github.com>
Co-authored-by: Parker Fawcett <259203091+Parker-Fawcett@users.noreply.github.com>
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